CVE-2017-7825

Several fonts on OS X display some Tibetan and Arabic characters aswhitespace. When used in the addressbar as part of an IDN this can be usedfor domain name spoofing attacks. Note: This attack only affects OS Xoperating systems. Other operating systems are unaffected. Thisvulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird <52.4.